package net.xxcl.exam.util;

import javax.servlet.http.HttpServletRequest;

/**
 * User: 夏汛
 * Date: 12-5-4
 * Time: 下午7:13
 */
public class RealIpUtils {

    /**
     * 获取真实ip
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {

        String ip = request.getHeader("x-forwarded-for");
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        }
        return ip;
    }
}
